Can You Master the 18-Electron Rule?
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Questions and Answers

Transition metals obey the ______ rule instead of the octet rule due to the involvement of d orbitals

18-electron

Which statement is true about the electron configurations of positive ions formed by transition and post-transition elements?

  • They have noble gas valence shell electron configurations.
  • They lose electrons from the shells with the lowest value of the principal quantum number.
  • They have the same electron configuration as their respective neutral atoms.
  • They do not follow the octet rule. (correct)
  • In a diatomic molecule, the bond moment is the ______.

    dipole moment

    When transition and post-transition elements form positive ions, electrons are always lost first from the shells with the highest value of the ______ quantum number

    <p>principal</p> Signup and view all the answers

    Which rule replaces the octet rule for transition metals?

    <p>The 18-electron rule.</p> Signup and view all the answers

    The dipole moment of a polyatomic molecule depends on the ______ of the molecule.

    <p>geometry</p> Signup and view all the answers

    Why do the atoms of transition and post-transition elements not usually obey the octet rule?

    <p>Because they do not have enough electrons to achieve the noble-gas configurations.</p> Signup and view all the answers

    If the bond moments are equal in magnitude but opposite in direction, then they will ______ each other and the resultant dipole moment will be zero.

    <p>cancel</p> Signup and view all the answers

    The positive ions of transition and post-transition elements do not have the usual noble gas valence shell electron configurations of ns2np6 and are not ______ with any of the noble gases

    <p>isoelectronic</p> Signup and view all the answers

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    "Test your knowledge on the 18-Electron Rule for Transition Metals and Post-Transition Elements. Learn why these atoms do not follow the octet rule and the challenges they face in achieving noble-gas configurations. Challenge yourself with questions on ionization energy and more in this informative quiz."

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